mazatta

I have constructed my core and OPL3 modules (with 2x512 chips) and would like to test the audio but I don't think I am understanding the output jack wiring properly (mbhp_opl3_interconnections.pdf), as I don't get anything out of the one jack I have wired up so far. I am using mono jacks, but I assume that is what should be used. Does pin 1 of J4 for instance connect to the tip of the first output jack and then the ring of that jack connects to the ground of J3? I don't have mine like that currently but that's the only other way that makes sense to my noob brain right now. Any input is appreciated, and hopefully this will push me to learn the ins and outs of these jacks :)

http://www.canakit.c...k342-uk342.html This circuit offers a symmetrical DC output of 12V / 200mA ideal for applications such as powering Op-Amp circuits. The output is fully regulated and also short-circuit protected. You can also increase the output current handling of the circuit up to 1A by adding two heat sinks to the regulator ICs and using a transformer with higher current ranting (up to a maximum of 1A I can't tell if it is switching or not, but is the fact that it is designed for op-amps a clue?

Is there any interest in another group buy for these chips? These are somewhat pricey in small quantities and Ebay isn't much better. I am still shopping around, but thought I would test the waters first.

I am looking at building a psu based off of NorthernLightX's schematic, but I am having difficulty tracking down an appropriate toroid transformer that will run on 110v and not break the bank. The only thing I could find so far that comes close to the 220v RKT 5012 used in the schematic and costs the least isthis one from DigiKey (amps seem too high though?) I have found manufacturers that specialize in these types of transformers, but they are at least twice the price of the one linked to above. Ebay doesn't seem to turn up anything useful either. The reason that I am building a psu, rather than repurposing something else (e.g. Amiga 500 psu), is that I want to build a MBFM and I don't want to use something that's 20+ years old. Has anyone in North America had success sourcing a transformer and/or building this psu? I appreciate any and all feedback! -Colin